Signaling system



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6 Claims. (Cl. 179-5) The present invention relates to a signaling and telephone system for police and lire brigades.

In a signaling system of this type, a number of alarm telephone apparatuses, for example in the form of street boxes, are connected to an operator position by a number of lines. The operator position is provided with means for identifying calling alarm telephone apparatuses and means for establishing communication between the same and an operator and preferably also for establishing connection with subscribers at other telephone exchanges. Furthermore, a system of this type must be very dependable and therefore the lines should be controlled by rest current. In case of a line fault, this immediately releases an alarm signal at the central installation.

One of the objects of the invention is to provide for an immediate indication at the central installation in case of a line fault and to make it possible to establish connection between a calling apparatus and the central installation, irrespective of whether the line is functioning normally or a line fault is at hand. Another object of the invention is to permit connection of a number of alarm telephone apparatuses to each line and to supply means by which any calling apparatus can be identified at the central installation.

An additional object of the invention is to provide arrangements for two different signals from the calling apparatuses and their indication in diiferent ways at the central installation.

The system is furthermore characterized by the following advantages:

The central installation is equipped with certain alarm and control devices common to all alarm boxes.

With different forms of line faults, including open box doors and locking handles that have only been partially actuated, a ringing signal is obtained. The faults are also indicated by a special lamp; one for each line.

The current in the line branches and current to ground are measured by an instrument in the central installation. The instrument also shows the intensity of the rest current, the direct current resistance in the telephone equipment (alarm boxes), a break in the line, a shortcircuit between the branches in a line, leakage between the rz-branch or b-branch and ground, also the battery voltage, charging current and discharge current etc.

The system normally works with current from the lighting network. In case of a net breakdown, the battery included in the installation is connected automatically and then takes over the current supply.

An arrangement for police flash signals can be connected.

Service calls, emergency calls and fault signals can be carried forward from the central installation to an installation at another place.

Manual or automatic operation of the alarm devices,

be arranged.

tats arenttween the branches) to connect the speech equipmentv of;

The central installation can be combined with a loudspeaker equipment.

The system may be combined with a radio installation.

Speechand time-recording equipment can be connected to the central installation, and come into operation in th event of an emergency call, for example. v

Automatic re alarm devices may be connected. It should be noted that they need not be provided either with alarm or fault indicating mechanisms.

The use for the alarm devices, provided for in this invention, is not, however, restricted solely to the lire and police service. Constantly increasing demands have been made in the course of years on communal services, for rapid intervention in case of emergencies of various kinds. Thus, in large and medium-sized cities and towns facilities must be available in the streets for calling an ambulance.

With regard to the police, it is also desirable that patroling policemen can be called from'the station by "ash signaling from an indicating lamp which should be installed on each alarm box. Similarly, a need exists for repair'personnel attached to various communal services, such as the communications, water and electricity works, to establish connection quickly with their respective departments. It is obvious that this is not possible with the alarm system employed hitherto. Also in these cases the telephone must be used. Attempts have actually been made in this direction, but only in a form supplementary to the ordinary lire telegraph installations. Thus, a system suitable for all emergency requirements has not been devised hitherto.

Three different applications of this invention are outlined in the following. One application as in rough outline is shown by Fig. 1 with a direct double-wire linel from each alarm box to the central station. A second, according to Fig. 2, permitting the connection of a number of alarm boxes to the same double-wire line; and a third, according to Fig. 3, employing a single-wire line in the form of a loop, to which a number of alarm boxes can be connected.

The three applications are substantially similar from a technical point of view, but the line costs are of course considerably higher for the system shown by Fig. l. The difference in the line length between the applications according to Figs. 1 and 2 is in the neighbourhood of 80%. On the other hand, the costs for the equipment of the boxes is somewhat higher for the system shown by Fig. 2. Owing to the low line costs, the system according to Fig. l will be most advantageous from an economic point of view except in cases where only very short lines are required.

As in the case of the fire alarm telegraph system, it is absolutely essential that individual indication for emergency calls from each calling box should be included in the central station equipment. As regards the application shown by Fig. 1 with its direct lines from every alarm box no diiculties are experienced in this respect. As` regards the other two applications, however, in which a number of boxes are connected to the same line the conditions are different, and the difficulties encountered in meeting this and all other demands have been considerable. The solution of the problem, which is both simple and natural, is based on an entirely new principle in relay technique.

As may be seen from Fig. 1, the box S1 is connected in a line L which passes from the central station. This is of the double wire type. The box is further provided with contact arrangements for connecting the line tot ground. This connection is employed both for indicating emergency calls to the central and also in the event of line faults (breakdown in one branch line or shortcircuit be- Patented Jan. 14, 1958 

